What makes alkali metal halides sometimes coloured, which are otherwise colourless?
Alkali metal halides have anionic sites occupied by unpaired electrons. These are called F-centres, and impart colour to the crystals of alkali metal halides. For example, the excess of lithium in LiCl makes it pink.
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Define the term ‘amorphous’.
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What is the maximum possible coordination number of an atom in an hcp crystal structure of an element?
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Which point defect lowers the density of a crystal?
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Name a substance which on addition to AgCl causes cation vacancy in it.
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Name an element with which germanium can be doped to produce an n-type semiconductor.
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What happens when a ferromagnetic substance is subjected to high temperature?
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How many atoms can be assigned to its unit cell if an element forms (i) a body centred cubic cell, and (ii) a face centred cubic cell?
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What is the nature of crystal defect produced when sodium chloride is doped with MgCl2?
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What is coordination number of a metal atom in ccp structure?